Impotencia translates to "helplessness" or "powerlessness." It's a deeply emotional word you don't often encounter in songs, used to describe a feeling of being unable to change a painful situation.
In the lyrics, the singer is "Llorando de impotencia" (Crying from helplessness) because the man she loves is leaving and she feels there's nothing she can do to stop him. This single word powerfully captures the song's core feeling of despair and heartbreak.
This song is a dramatic conversation between two friends having a relationship crisis. One friend is completely heartbroken, telling the other, "Amiga, tengo el corazón herido" (Friend, my heart is wounded) because the man she loves is leaving her. She feels totally powerless, saying she's "llorando de impotencia" (crying from helplessness) and can't make him stay.
Her friend's response is some serious tough love. Instead of just offering comfort, she insists, "tú tienes que luchar por ese amor" (you have to fight for that love). When the heartbroken friend says she's already given him everything, the other friend just replies, "Inventa un modo" (Invent a way). In the end, the first friend feels the advice isn't helping her pain. She concludes that this is all just part of the deal when you're in love: "Son cosas del amor" (These are things of love).